Variables

a,b
→
Legs
h
→
Height
α, β
→
Angles
ma, mb, mc
→
Medians
R
→
Radius od circumscribed circle
r
→
Radius of inscribed circle
A
→
Area
1.
$\alpha + \beta = 90\degree$
Right triangle
Angle
2.
Pythagorean theorem
$c^2=a^2+b^2$
Right triangle
Side
3.
Right triangle area
$A=\dfrac{ab}{2}$
Area
Right triangle
4.
Right triangle area
$A=\dfrac{ch}{2}$
Area
Right triangle
9.
Circumcircle radius
$R=\dfrac{c}{2}$
Circumcircle R
Right triangle
10.
Incircle radius
$r=\dfrac{a+b-c}{2}$
Incircle r
Right triangle
11.
Sine definition
$\sin\alpha = \dfrac{a}{c}$
Right triangle
Trigonometry
12.
Cosine definition
$\cos\alpha = \dfrac{b}{c}$
Right triangle
Trigonometry
13.
Tangent definition
$\tan\alpha = \dfrac{a}{b}$
Right triangle
Trigonometry
14.
Median of leg a
$m_a=b^2+\dfrac{a^2}{4}$
Right triangle

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